Athlon II X3 400e vs Ryzen 7 5800X

CPU

GPU

Athlon II X3 400e

3 Cores3 Thrd45 WWMax: 2.2 GHz2009

Similar parts

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Ryzen 7 5800X

8 Cores16 Thrd105 WWMax: 4.7 GHz2020

Ryzen family

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Athlon II X3 400e vs Ryzen 7 5800X Performance Spectrum

Athlon II X3 400e

3 / 3

1,320

0.0%

Ryzen Threadripper PRO 3955WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Ryzen 7 5800X

8 / 16

27,712

+1999.4%

Ryzen Threadripper 3990X

Ryzen Threadripper PRO 9965WX

About PassMark

PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.

Athlon II X3 400e vs Ryzen 7 5800X FPS Benchmarks

Predicted gaming performance across popular games. Tested paired with GeForce RTX 5090 to isolate CPU performance.

Search any supported game below to compare 1080p FPS for both components.

Athlon II X3 400e vs Ryzen 7 5800X: Pros, Cons & Final Verdict

See where each CPU makes more sense in practice: gaming, heavier work, platform cost, power draw, and upgrade path.

Athlon II X3 400e

2009

Why buy it

✅Costs $349 less on MSRP ($100 MSRP vs $449 MSRP).
✅Draws 45W instead of 105W, a 60W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 7 5800X across 50 shared CPU benchmark tests.
❌Lower PassMark (1,320 vs 27,712).
❌Lower PassMark per dollar, at 13.2 vs 61.7 PassMark/$ ($100 MSRP vs $449 MSRP).

Ryzen 7 5800X

2020

Why buy it

✅Better for gaming: +631.0% higher average FPS across 50 shared CPU benchmark tests.
✅Delivers 367.6% more PassMark for each dollar spent, at 61.7 vs 13.2 PassMark/$ ($449 MSRP vs $100 MSRP).
✅100+% more PCIe lanes (24 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌
349% HIGHER MSRP
$449 MSRPvs$100 MSRP
❌133.3% higher power demand at 105W vs 45W.

Quick Answers

So, is Ryzen 7 5800X better than Athlon II X3 400e?

Yes. Ryzen 7 5800X is the better all-around CPU here. It gives you a 631.0% average FPS lead across 50 shared CPU game tests in our data, 1999.4% better PassMark, and the stronger long-term platform, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Ryzen 7 5800X is the better pick. According to our tests, it delivers 631.0% more average FPS across 50 shared CPU game tests.

Which one is better for streaming, content creation, and heavy multitasking?

For streaming, content creation, and heavier multitasking, Ryzen 7 5800X is the stronger fit. You are getting 1999.4% better PassMark, backed by 8 cores and 16 threads.

Which one is the smarter buy today, not just the cheaper CPU?

Ryzen 7 5800X is the better buy right now. Ryzen 7 5800X comes in 349.0% more expensive on MSRP at $449 MSRP versus $100 MSRP, and it still gives you a 631.0% average FPS lead across 50 shared CPU game tests in our data. It is also 367.6% better value on MSRP (61.7 vs 13.2 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

Which one is more future-proof for 2026 and beyond?

Ryzen 7 5800X makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2020 vs 2009) and more multi-core headroom with 8 cores / 16 threads instead of 3/3. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Athlon II X3 400e vs Ryzen 7 5800X Technical Specifications

Side-by-side specs, architecture details, clocks, memory, power, and platform differences.

Athlon II X3 400e

The Athlon II X3 400e is manufactured by AMD. It was released in 20 October 2009 (16 years ago). It is based on the Rana (2009−2011) architecture. It features 3 cores and 3 threads. Base frequency is 2.2 GHz, with boost up to 2.2 GHz. L3 cache: 0 kB. L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: AM3. Thermal design power (TDP): 45 Watt. Memory support: DDR3. Passmark benchmark score: 1,320 points. Launch price was $107.

Ryzen 7 5800X

The Ryzen 7 5800X is manufactured by AMD. It was released in 5 November 2020 (5 years ago). It is based on the Vermeer (Zen 3) (2020−2022) architecture. It features 8 cores and 16 threads. Base frequency is 3.8 GHz, with boost up to 4.7 GHz. L3 cache: 32 MB. L2 cache: 512K (per core). Built on 7 nm, 12 nm process technology. Socket: AM4. Thermal design power (TDP): 105 Watt. Memory support: DDR4. Passmark benchmark score: 27,712 points. Launch price was $449.

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Processing Power

The Athlon II X3 400e packs 3 cores / 3 threads, while the Ryzen 7 5800X offers 8 cores / 16 threads — the Ryzen 7 5800X has 5 more cores. Boost clocks reach 2.2 GHz on the Athlon II X3 400e versus 4.7 GHz on the Ryzen 7 5800X — a 72.5% clock advantage for the Ryzen 7 5800X (base: 2.2 GHz vs 3.8 GHz). The Athlon II X3 400e uses the Rana (2009−2011) architecture (45 nm), while the Ryzen 7 5800X uses Vermeer (Zen 3) (2020−2022) (7 nm, 12 nm). In PassMark, the Athlon II X3 400e scores 1,320 against the Ryzen 7 5800X's 27,712 — a 181.8% lead for the Ryzen 7 5800X. L3 cache: 0 kB on the Athlon II X3 400e vs 32 MB on the Ryzen 7 5800X.

Feature	Athlon II X3 400e	Ryzen 7 5800X
Cores / Threads	3 / 3	8 / 16+167%
Boost Clock	2.2 GHz	4.7 GHz+114%
Base Clock	2.2 GHz	3.8 GHz+73%
L3 Cache	0 kB	32 MB
L2 Cache	512 kB (per core)	512K (per core)
Process	45 nm	7 nm, 12 nm-84%
Architecture	Rana (2009−2011)	Vermeer (Zen 3) (2020−2022)
PassMark	1,320	27,712+1999%

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Memory & Platform

The Athlon II X3 400e uses the AM3 socket (PCIe 2.0), while the Ryzen 7 5800X uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3-1333 on the Athlon II X3 400e versus DDR4-3200 on the Ryzen 7 5800X — the Ryzen 7 5800X supports 140.1% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Ryzen 7 5800X supports up to 128 GB of RAM compared to 32 GB — 300% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 0 (Athlon II X3 400e) vs 24 (Ryzen 7 5800X) — the Ryzen 7 5800X offers 24 more lanes for additional GPUs or NVMe drives. Chipset compatibility: AMD AM3 (Athlon II X3 400e) and AMD 500 series,AMD 400 series,AMD 300 series (Ryzen 7 5800X).

Feature	Athlon II X3 400e	Ryzen 7 5800X
Socket	AM3	AM4
PCIe Generation	PCIe 2.0	PCIe 4.0+100%
Max RAM Speed	DDR3-1333	DDR4-3200+140%
Max RAM Capacity	32 GB	128 GB+300%
RAM Channels	2	2
ECC Support	No	Yes
PCIe Lanes	0	24

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Advanced Features

Virtualization: not specified (Athlon II X3 400e) / AMD-V (Ryzen 7 5800X). Primary use case: Ryzen 7 5800X targets Desktop.

Feature	Athlon II X3 400e	Ryzen 7 5800X
Integrated GPU	No	No
Unlocked	—	Yes
AVX-512	—	No
Virtualization	—	AMD-V
Target Use	—	Desktop

💰

Value Analysis

At launch, the Athlon II X3 400e was priced at $100, while the Ryzen 7 5800X came in at $449. On launch pricing ($100 vs $449), Athlon II X3 400e was $349 cheaper. In terms of value on MSRP (PassMark points per dollar), the Athlon II X3 400e delivers 13.2 pts/$ vs 61.7 pts/$ for the Ryzen 7 5800X — making the Ryzen 7 5800X the 129.5% better value option.

Feature	Athlon II X3 400e	Ryzen 7 5800X
MSRP	$100-78%	$449
Performance per Dollar	13.2	61.7+367%
Release Date	2009	2020

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